Because the Perf. Analyzer is now set to vacuum as default, for jets the performance shows as zero as default and the CoT shows as small and is hard to see unless the slider is moved to a lower altitude setting, and then deselecting then reselecting CoT again. Merely moving the slider will not move the CoT to the new position.
Also the CoT does not change based on the engine performance at a given altitude, it only shows in 2 positions, one is in "vacuum" and the second is in what I think might be performance at Sea Level but since the CoT does not change with the altitude slider, I can't be sure.
@AndrewGarrison Thank you :D